Support arrangement for mounting the mechanism located under the base of sewing machines



Jan. 30, 1962 A. MoRo 3,018,747

sUPPoRT ARRANGEMENT FoR MOUNTING THE MEcHANIsM LocATED UNDER THE EASE oF sEwING MACHINES EiIed April s, 195e nventor /vra/v/a More Attorney United States Patent O SUPPORT ARRANGEMENT FR MGUN'HNG THE WCHANISM LQCATED UNDER THE BASE F SEWING MACHINES Antonio Moro, Milan, Italy Filed Apr. 3, 1956, Ser. No. 575,799 Claims priority, application italy Apr. 14, 1955 1 Claim. (Cl. lll-258) In sewing machines the machine elements located under the base of the machine and namely those for the transmission of motion to the hook and the cloth feed claw are ordinarily mounted in supports established upon seats formed on the base itself.

This renders the machining of the base of the machine laborious and costly, for it is a question of forming elements requiring great precision from a complex workpiece.

To obviate this complicated machining operation, it has been proposed to fix underneath the base of the sewing machine a system of separate supports, so combined together as to ensure the regular mounting of the above mentioned machine elements.

Even in this manner the machining diiculties in the fabrication of sewing machines are reduced. However, the exact fitting requirements that the various supports combined together require in order that the exact location of the elements therein assembled and necessary for a regular operation of the machine be ensured are of a small degree.

The fabrication of sewing machines is appreciably simpliiied, their cost reduced and their operation at the same time improved by the support member for mounting the machine elements arranged under the base of the machine that is the object of the present invention.

This arrangement is characterized by the fact that it is constituted by a readily detachable single support member detachably mounted on fthe under side of the sewing machine base. The support member is so shaped as to carry the seats of all the elements required for the assembling and operation of the operating members of the machine. More particularly, the support member according to the invention carries the driving shaft of the hook, the hook operating shaft, the seat body of the hook and the claw driving shaft. The hook actuating shaft, as a particular case, is able to be mounted in a bearing integral with the seat body of the hook. All these elements can be mounted and adjusted before applying the support member of the machine upon its base thus greatly simplifying the machine, the fitting operation and the adjustment thereof.

According to a further feature of the invention, the seat body of the hook, with or without the bearing of the hook actuating shaft, carried by the support member, constitutes a part by itself, that is detachably mounted on the support member. Thus, the advantage is established of being able to separately machine the said seat body which on account of operating necessities presents weak points, and easily substituting it when necessary, without having to discard the entire support member in case of eventual breakage.

An example of an embodiment of the arrangement according to the invention is illustrated in the .annexed drawing, in which:

FIG. 1 is a plan view of the arrangement applied to theunderside of the sewing machine;

FIG. 2 is partial elevation of the arrangement viewed in the di-rection 0f arrow A of FIG. l, and

FIG. 3 is a modification of 1a particular portion of FIG. 1.

wf' 1C@ Referring 4to FIGS. l and 2 of the drawing, by .1 is indicated the support member, which is fixed by means of the screws 2 onto the under side of the base 3 of the sewing machine. The support member 1 contains; the feed claw driving shaft 4 rotatably mounted upon the two counterpoints 5 fixed in special seats of the support member by means of the screws 6; the hook driving shaft 7 mounted in the two bearings 8; the hook actuating shaft 9 mounted in the bearing 10 and the seat body 11 of the hook. The feed claw driving shaft 4, which receives its oscillatory movement from the stitch adjusting mechanism such as that disclosed by US. Patent No. 1,877,757, carries with the two projections 12 the movable claw 13. The hook driving shaft 7 receives its oscillatory movement by the mechanism crank-shaft connecting rod, also disclosed by U.S. Patent No. 1,877,757, and carries the half bevel gear 14 meshing with the bevel gear 15 xed upon one end of the hook actuating shaft 9, which carries at the other end the hook operating sector 16. The seat body 11 is fixed to the support member 1 by means of the screws 17 and 18.

As it is clear from the drawing, it is suiiicient 'to unscrew the three screws 2 to demount the whole base group which, being entirely independent of the working members placed below it, results in a simply and rapidly demountable unit.

By only slightly undoing the three screws 2 it is possible, due to an elongated configuration Z1 of the holes through which pass the said screws to slightly move the unit in order to tix it in the best position with respect to the needle and the members that are to be connected to the said unit.

As shown in FIG. 3, the sector 16 pushing the hook 16 is shown in section. Through this section there is clearly seen the circular seat 11 of the seat body 11 wherein the hook 16' is guided in its oscillating movements under the action of oscillating hook sector 16 connected to shaft 9.

According to the modification shown in FIG. 3, the bearing 10 of the hook actuating shaft 9 `is formed in one piece with the seat body 11 of the hook, in such a manner as to be demountable together with the seat body 11 of the hook from the support member 1.

It is clear that the particulars of construction and application of the arrangement can Vary with respect to those represented in the drawing and above described, the arrangement still remaining within the scope of the invention. Thus, for instance,- in place of counterpoints, ball or roller bearings can be set in the support member 1 for supporting the feed claw driving shaft 4. The seat body '11 of the hook instead of being fastened by means of screws 17 and 18, can be fixed in a recess of the support member 1 intended to receive it, either by press fit or in any other suitable manner. Instead of by three screws 2 the support member 1 can be fixed onto the machine with a different number of screws or by differing fastening means and so on.

What I claim is:

In a sewing machine having a support member provided with means for detachably and adjustably mounting said support member to the underside thereof, said support member carrying a driving shaft for driving a feed claw, a hook-drive shaft disposed parallel to said driving shaft, a half-bevel gear mounted on one end of said hook-drive shaft, a hook-actuating shaft mounted in a bearing and disposed perpendicular to said hookdrive shaft, a bevel gear mounted on one end of said hook-actuating shaft meshing with said half-bevel gear, and a seat body having a circular seat for the hook of the sewing machine including a hook-operating sec- References Cited in the file of this patent UNITED STATES PATENTS 1,295,133 De Voe Feb. 25, 1919 1,877,757 Hemleb Sept. 20, 1932 lo 2,009,328 Sauer July 23, 1935 4 Gonyk Aug. 6, 1935 Strain Ian. 10, 1939 Waterman May 20, 1941 Schmitt Dec. 21, 1943 Chason Feb. 15, 1944 Christensen Oct. 10, 1944 Hohmann Sept. 8, 1953 Toombs Mar. 9, 1954 FOREIGN PATENTS Sweden Apr. 2, 1935 

